Chemical fire-extinguisher.



R. J. LOGAN. CHEMICAL FIRE EXTINGUISHER.

APPLICATION FILED AUG. 22, 1913.

1, 1 32,596. Patented "Mar. 23, 1915.

Fig.1.

Roberl J. Logan I W B65565 Per All'orney THE NORRIS PETERS C0,. PHOTOJJTHO" WASHINGmN. O. c.

' sraras PATENT carton.

ROBERT JOHN LOGAN, OF ST. JOHN, NEW BRUNSWICK, CANADA.

CHEMICAL FIRE-EXTIN'G-UISHER.

Specification of Letters Patent.

Application filed August 22, 1913. Serial No. 786,130.

' are charged with the bicarbonate solution,

and the mineral acid is carried in a bottle displaceably supported 7 within the shell,

such bottle being displaced and its. contents mixed with the bicarbonate solution by manipulating an external part The principal loss in extinguishers of this type when in operation has been through the passage for the device connecting the external manipulated part and the acid bottle, and the object of my invention is to prevent leakage at this point, and thereby increase the efliciency of appliances of this type. Another difiiculty experienced with extinguishers of this type is that the bottle is very easily unsealed by careless handling resulting in the untimely mixture of the acid with the bicarbonate solution. To overcome this defect is a further object of my invention.

The invention may be said briefly to consist in a fire extinguisher of means retaining the bottle upon the bottom of the extinguisher and adapted to slmultaneously release and unseal said bottle; and the invention further consists of the construction, combination and particular arrangement of parts hereinafter described and illustrated.

For full comprehension, however, of my invention reference must be had to the ac-' companying drawings forming a part of this specification in which similar reference characters indicate the same parts, and wherein:

Figure 1 is a planview of my improved fire extinguisher; Fig. 2 is a side elevation thereof partly in vertical sectional view; Fig. 3 is a horizontal sectional view taken on line A A Fig. 2. Fig. 4 is a detail axial sectional view of the bottle-neck, lower tube and cork, with the rod in position placing the cork partly in the tube and partly in the bottle-neck, and retaining the mouth o f the Patented Mar. 23, 1915.

bottle in contact with the edge of the tube.

The shell I) is in the main, of usualconstruction; the only point of difference being 1n the cover 0, which is formed with an opening, the edge whereof has an internal screw threaded ring cl rigidly screwed thereto. This ring aifords the necessary means for connecting the carrier and operating device for the acid bottle 6. This-contrivance comprises a cap f having an eX- ternally screw-threaded flange 9 adapted to be screwed into the ring d, and a lateral flange overhanging such ring. A gasket 7;

packs the joint between the capand cover, which is tightened by any suitable means. The cap and boss have a hole m axially therethrough, and a short metal tube 7 is cast in one with or otherwise rigidly secured at one end to, the inner side of the cap.

is provided with a handle V. Another cork 7' is carried by the rod 8 near its upper end and is adapted to be jammed into and close the tube 11. when the cork 0 is withdrawn from the acid bottle.- To facilitate this withdrawal a tube p similar in construction to the tube n is carried by, a pair of'stift' wires or rods 9 at their lower ends and in close proximity to the bottle, such wires being soldered or otherwise secured to the tube n. The tube 39 and the neck of the bottle are of the same bore and as the rod 8 is pulled out, the bottle is lifted until its lip bears upon the edge of the tube at which point as the tube is sustained in position by the wires q, the withdrawal of the cork'from the bottle into the tube is easily accomplished. The corks are retained in proper relative position by pairs of nuts t and u respectively.

As the cork 0 is not completely dislodged from the tube 39 when the bottle is sealed and as the cork r is barely out of contact with the lower end of the tube. n when the bottle is resting on the bottom of the eX- tinguisher and the cover screwed into place the bottle cannot become opened through careless handling as the weight thereof in the event of the extinguisher being upset is not sufficient to force the corks into their respective tubes.

The outer end of the rod 0 has a handle o.

The extinguisher is charged by removing the cap, filling the shell with the bicarbonate and the bottle with the acid. The rod 8 is then pulled out until the cork is contained well within the tube, and with the flared mouth or the latter held tightly over the mouth of the bottle, the cork 0 is forced into the neck, without, however, being completely dislodged from the tube; the efi'ect being that both tube and bottle are sealed, and the latter firmly but displaceably supported. The cap is then screwed tightly and the appliance is ready for use.

When it is desired to operate the extinguisher the rod is pulled up, and the corks accompanying it enter farther into the tubes and the cork r coming tightly into contact with the inside of the cap, and, at the same time, being jammed into the tube a a per-- feet seal is eifected which obviates any chance of leakage through the cover. At the same time, the bottle, being thereby released, falls into the bicarbonate solution with the usual resultant chemical reaction and generation of carbon dioxid (carbonic acid gas).

It is to be noted that the cork etlectively seals the only possible leak, the gasket and nut making a practically perfect joint; and in this manner the extinguisher has an externally manipulated part with internal action without the necessity of the stufiing box usually required under such conditions. It is to be also noted that my improved fire extinguisher will not be discharged even if accidentally upset unless the cork is pulled out or the said bottle.

What I claim is as follows 1. In a chemical fire extinguisher the combination with a shell having a comparatively small opening in its upper end, of a cover for closing said opening, a boss upon the cover, the boss and cover having a hole therethrough, a rod slidable in the hole and having a finger-hold at its outer end, a tube mounted rigidly upon the inside of the cover concentric to the rod, a second tube, means supporting this second tube from the cover, a bottle the neck of which is equal in bore to the second tube, and a cork secured upon the inner end of the rod and movable with the rod from the neck into the second tube. and a second cork upon the rod and adapted to seal the hole through the cover simultaneously with the extraction of the other cork from the bottle neck, and means preventing displacement of the corks upon the rod, substantially as described.

In a chemical fire extinguisher the combination with a shell having an opening therein and means for closing the said opening, said means having a hole therein, a rod slidable in the hole and having a fingerhold at its outer end, a tube mounted rigidly upon the inside of said means concentric to the rod, a second tube, a pair of rigid wires supporting this second tube from the tube first mentioned, a bottle the neck of which is equal in bore to the second tube, and a cork secured upon the inner end of the rod and adapted to be simultaneously contained within the second tube and bottle-neck and movable with the rod from the neck into the second tube, and a second cork upon the rod and adapted to seal the said hole in the ineans for closing the opening in the shell simultaneously with the extraction of the other cork from the bottle neck, and means preventing displacement of the corks upon the rod, substantially as described.

in testimony whereof l have signed my name to this specification in the presence of two witnesses.

ROBERT JOHN LOGAN. Witnesses:

JOHN A. BARRY, ANNIE F. CoUsHLAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

